Method of producing support for planographic printing-plate

Abstract

A support for a planographic printing plate is produced by continuously performing casting and hot-rolling from molten aluminum to form a hot-rolled coil of a thin plate, transforming the hot-rolled coil into an aluminum support through cold-rolling, heat-treatment and correction, and finally, graining the aluminum support.

What is claimed is: 
     
       1. A method of producing a support for a planographic printing plate, comprising the steps of: continuously performing casting and hot-rolling from molten aluminum for forming a hot-rolled coil of a thin plate, wherein said continuously performing step comprises the steps of: maintaining a body of molten aluminum;   casting a sheet of aluminum from said body using a casting machine;   hot-rolling said sheet of aluminum into thin plate using a hot-rolling machine; and   coiling said thin plate into a hot-rolled coil using a coiler machine; obtaining an aluminum support from said hot-rolled coil through cold-rolling, heat-treatment, and correction; and     performing graining on said aluminum support;   wherein said body of molten aluminum is maintained at a minimum of 800° C., and said casting step is performed within the temperature range of 650° C. to 750° C. and said sheet of aluminum is cast at a thickness of 100-300 mm.   
     
     
       2. A method of producing a support for a planographic printing plate, comprising the steps of: continuously performing casting and hot-rolling from molten aluminum for forming a hot-rolled coil of a thin plate, wherein said continuously performing step comprises the steps of: maintaining a body of molten aluminum;   casting a sheet of aluminum from said body using a casting machine;   hot-rolling said sheet of aluminum into thin plate using a hot-rolling machine; and   coiling said thin plate into a hot-rolled coil using a coiler machine;     obtaining an aluminum support for said hot-rolled coil through cold-rolling, heat-treatment, and correction; and   performing graining on said aluminum support; wherein said hot-rolling step is performed within the temperature range of 350° C. to 550° C. and said thin plate is hot-rolled to a thickness of 10-50 mm.   
     
     
       3. A method of producing a support for a planographic printing plate, comprising the steps of: continuously performing casting and hot-rolling from molten aluminum for forming a hot-rolled coil of a thin plate, wherein said continuously performing step comprises the steps of: maintaining a body of molten aluminum;   casting a sheet of aluminum from said body using a casting machine;   hot-rolling said sheet of aluminum into thin plate using a hot-rolling machine; and   coiling said thin plate into a hot-rolled coil using a coiler machine;     obtaining an aluminum support from said hot-rolled coil through cold-rolling, heat-treatment, and correction;   performing graining on said aluminum support; and,   pretreating said body of molten aluminum before performing said casting step, for removing predetermined contaminant materials.